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Windows 7: Disk part>List disk - Disks show no media?

I'm new to this forum, and I have no idea what to do, but I started up my computer, and it didn't start up all the way, so I put in an install/recovery disk and checked my CMD, and it shows a X:\Sources .. I don't know what that is.
I tried inputting C: but it says "The device is not ready."
I entered Diskpart and list disk, and it shows 4 disks, all the statuses say "No media" all the sizes are "0 b" and I have no clue what to do from this point on.
I'm very lost and not so good at computers, so any help to fix this solution will be much appreciated.

Does the BIOS run and carryout the check? Do you hear a single beep on completion of BIOS run?

If the BIOS itself does not run, it may be a problem with the Power Supply - either it has gone bad or shutting down due a defective addon.

I go with TVeblen in troubleshooting. Disconnect all your hard drives (except the system disk with Windows), optical/floppy drives, all cooling fans (other than the ones connected to your motherboard). (Remove both power cables and datacables from the additional addons)

Power on your PC with this minimum configuration and give a verbatim report what exactly happens when you power on without missing any detail.

Disk part>List disk - Disks show no media?

Windows 7 - system recovery - list disk no mediaMy PC was working fine, but now when I boot up it goes to Windows Error Recovery screen. In the System Recovery Options screen there are no Operating Systems listed, and in Command Prompt when I go 'diskpart' and then 'list disk' all the disks (0 to 3) have a status of 'No Media', Size '0B', and...

Backup and Restore

i cant get disk management show right disk spacei just go a 3tb drive and it shows the right size in my startup screens and everything but when i get in windows to partition it is only 746GB i have tried switching it from MBR over to GPT and from basic to dynamic but still no change any 1 have any ideas
http://i62.tinypic.com/2w6t8p3.png

Hardware & Devices

Why USB external hard disk show now " The disk need to be formatted"I don't know what is my problem because is not the first time that usb external hard drive is working fine until get damage and said " it need to be formatted " and lost all the INFO because I have to format again the disk to be usefull. Also it is not the same hard disk.:cry:

Hardware & Devices

Move windows 7 installation from one disk partition to other disk partMove windows 7 installation from one disk partition to other disk partition
HI all ,
Before going into details of my problem, I am listing down my system setup.
I have 3 HDDs on my pc with following details :-
1. Disk 0 - 500 GB - Windows 7 32-Bit Installation on C: - Partitions ( C -...

Installation & Setup

What are the characteristics of the 2 part's on disk 2?I have XP and 7 up/running on disk device 1. And have duplicated such (2 partitions) on disk device 2, using Partition Wizard.
What are the characteristics of the 2 part's on disk 2?
For instance, would either/both boot in an emergency?
Thx,
P